Ford Knock Sensor Control - 03 Marauder

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Ford Knock Sensor Control - 03 Marauder

Unread postby decipha » Sun Jul 23, 2017 1:29 am

so yesterday night I decided I was going to re-enable the knock sensor on my marauder and actually dial it in so it can detect knock accurately, in short it turned out excellent

its been stated many times that the stock knock sensors are crap and most people disable them. Contrary to that the stock ford knock sensors function excellent and do everything you can ever want in a knock sensor when you have them dialed in correctly, that's been my experiences and I stand by that, always have and always will.

On the stock Marauder tunes the knock sensor is set to yank out 3 degrees of timing at WOT on the big end, THATS IT. Its configured so that it will always yank timing regardless if theres knock detected or not. Its absolutely useless from a stock implementation.

As some may already know, I have my marauder de-tuned to run 87 octane as they specifically require 93 as do all 4 valves AFAIK.

Well, even before I swapped to 87 way back when, I disabled the knock sensor as I knew it was detecting false knock with 93. As i progressed into the 87 octane tune I left it disabled.

My spark table Ive dialed in using my best guess, trial and error, and listening out for detonation, the same as I do any spark table.

So last night I spent about an hour adding a bunch of the knock scaling and parameters to rzasa. It actually started by me looking to do some n2o code on cvaf1 for a friend and I found a function at the tail end of the borderline spark routine that actually removes 5 degrees of timing from borderline anytime the knock sensor is deemed faulty.

Well I was far enough in that I figured I would follow it through, and less than an hour later I had her dialed in and functioning perfectly. I allowed the ecu to add spark up to the amount of spark i deem to be MBT to the spark advanced table, one cell I had at +19 degrees that would be accurate if I were running race fuel. I then set the retard table to allow up to -19.5 degrees of spark to be yunk if theres knock detected. Much to my surprise the knock sensor added in 2-3 degrees on average with 3.5 being the absolute most added. I drove to craigs house today ~1 hr on the interstate with traffic and inclement weather, needless to say I probably hit every part of the spark table one can and there was not a SINGLE EVENT OF KNOCK DETECTED. At WOT it added only 1 degree which gave me 10 from my commanded 9. At cruise Im commanding 26 degrees, of which 41 degrees is stock, the knock sensor only added 3 degrees bumping me to 29. I found all of that to be just incredible, it really makes me feel warm and fuzzy knowing that I got the spark table perfect using my conventional methods. Its very reassuring to say the least. And interestingly, I get the same 20.2mpg at 26 deg of timing cruising with 87 that i do at 41 deg with 93 octane.

I simplified the gain by setting both tables to all 7s and diales the threshold tables in, I found I needed a slightly more sensitivity threshold at 50-70 load between 1750-2250 rpm which is the most prone area for detonation on the 4v's.

Today I tuned an 06 GT with dual stock knock sensors, much to my surprise they were configured very similar to how I dialed in mine yesterday which further solidifies my values I reached.

Just thought Id share to help spread knowledge on just how excellent the stock knock sensors are on even these older vehicles. Maybe clear up some of the mistruths people say just cuz they don't take the time to actually dial them in.

The real test will be when I fill up with 93 to see if it adds timing in to where I think it should be. I'll post back when that time comes.
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decipha
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Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Ford Knock Sensor Control - 03 Marauder

Unread postby Pappacosworth » Sun Jul 23, 2017 2:49 pm

nice to know, I have similar engine.
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Vehicle Information: Ford Mustang Cobra -94 Mach swap in progress
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Re: Ford Knock Sensor Control - 03 Marauder

Unread postby decipha » Thu Jul 27, 2017 5:34 pm

well it worked impeccably, I filled up with 93 and went for a WOT pass, she climbed all the way up to 19.5 degrees at WOT on the big end all on her own ;) Interestingly she didnt add any timing in 1st, it seemed like it didnt start dumping timing in until it hit second, imma have to dig into the events and constants and see whats causing the delay when i get some free time
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decipha
Tooner
 
Posts: 13363
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce

Re: Ford Knock Sensor Control - 03 Marauder

Unread postby decipha » Fri Aug 11, 2017 4:20 am

well I did some testing, I strapped her down day before yesterday just cuz it's easier for me to monitor with exacting conditions and did some testing, not only that i had to recalibrate the dyno so figured might as well. I made 5 pulls, 4 with modified tunes and 1 with the stock bmd0 tune loaded in, all 4 pulls made exactly 229rwhp, when i loaded in the stock bmd0 tune she made 217rwhp they all made peak power at 5400 rpm, peak tq is right around 4200 or so (wasn't logging rpm on dyno), i didn't log the bmd0 tune since i never wrote any datalogging for RZAO1 but after typing this I realized I prob should have just used CRD1 as my stock test, I'll do that when i get a chance for comparison

anywho, here's a little chart i whipped up of the actual timing i got with the knock sensor dialed in, its interesting to check it out, you can see just how accurate and consistent the knock sensor really is, I loaded in my 87 octane tune which has up to 19 degrees less timing in one cell as compared to my 93 octane tune, the 87 octane tune commands 10 degrees of timing at WOT, yet you can see the knock sensor pull it on up with no knock detected, my 93 octane tune which is pretty much what I have commanded almost at 19.5 deg, and my e85 tune which has a bit more timing in it (commanding 23), for all 3 of these pulls I had 93 octane in it doing them back to back, no shut down no cool off, all 4 pulls made exactly 229rwhp and as you can see it should have as the knock sensor commanded the exact same amount of timing at WOT regardless of what I commanded, the 4th pull was my 93 tune ran back to back to make sure she was consistent, which she was dead on balls accurate so i didnt include it below

You can see at the beginning the knock sensor is slow to add timing down low, i still need to dig in to it to see whats up with that, most likely just the rpm advance rate function is low, i did add the SPKAD payload to the universal adx yesterday so i can now log the knock sensor contribution, i can see it is a bunch more active in 3rd and 4th gear compared to being in the same cells and conditions in 1st and 2nd, anywho heres the results, these were all done locked up in 3rd, from 35 to 130 mph, engine is 100% bone stock as she rolled off the assembly line down to the stock type air filter and all with 240k miles on the clock, she still runs like a top and actually runs better than the 04 marauder the previous owner replaced her with according to his butt-dyno with only 60k on the clock

RPM | 87 | 93 | E85
2000 | 5.75 | 20.50 | X
2250 | 10.00 | 21.00 | 21.25
2500 | 13.50 | 21.75 | 22.00
2750 | 16.25 | 20.25 | 20.25
3000 | 19.75 | 20.00 | 19.75
3250 | 19.50 | 20.00 | 20.00
3500 | 15.25 | 20.25 | 20.00
3750 | 15.00 | 14.75 | 15.00
4000 | 13.75 | 14.50 | 14.50
4250 | 14.50 | 14.25 | 14.50
4500 | 14.00 | 14.00 | 14.00
4750 | 19.50 | 19.50 | 19.25
5000 | 20.25 | 20.25 | 20.25
5250 | 20.50 | 20.50 | 20.50
5500 | 20.75 | 20.75 | 20.50
5750 | 20.75 | 21.00 | 20.25
6000 | 20.25 | 20.50 | 20.75

for reference, the 87 octane tune was commanding 10 deg, 93 octane commanding 19.5 deg, and e85 was commanding 23 deg, the knock sensor is undeniable its definitely working flawlessly

you can see the low 14 deg timing at 4500 rpm, interesting enough, the 04 marauder only wanted 16 deg in that range with 93 octane

i'll post back with how she does on 87 octane and the stock crd1 timing
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decipha
Tooner
 
Posts: 13363
Joined: Mon Jul 15, 2013 5:29 pm
Location: New Orleans, LA
Name: Michael Ponthieux
Vehicle Information: Supercoupin' x10
90 (4x 5spds) - Dante, Ruby, Daja, Ava
91 4r70w - Skarlett
92 (2x) 5spd & auto - Bianqa, Andrea
93 auto - Danika
94 5spd Rionda
95 auto Aisha
Vehicle 2 Information: Others:
00 Lincoln LS - Luanda
98 Camaro SS - Bounquisha
02 Harley F-150 - Sasasha
03 Marauder - DyShyKy
00 Explorer 5L - Bernyce


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